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t tab = d bola = 2r
V bola : V tab = ⁴/₃ π r³ : π r² t = ⁴/₃ r : t =
V bola : Vtab = ⁴/₃ r : 2 r = ⁴/₃ : 2 = 4 : 6 = 2 : 3